Buggy code:
public class ConnectionFactory { private static Hashtable connectiontypes = new Hashtable ( ) ; private static Trace debug = Trace . create ( "connectionfactory" ) ; public static final ConnectionDescription addDescription ( ConnectionDescription scd ) { } protected static ConnectionDescription addDescription0 ( ConnectionDescription n ) { } public static final boolean containsDescription ( ConnectionDescription scd ) { } protected static boolean containsDescription0 ( ConnectionDescription scd ) { } private static void debug ( String msg ) { } private static void dumpStack ( String msg , Throwable e ) { } public static final ConnectionDescription getDescription ( ConnectionDescription scd ) { } protected static ConnectionDescription getDescription0 ( ConnectionDescription scd ) { } protected static ConnectionDescription getDescription0 ( String name ) { } public static final ConnectionDescription getDescriptionByName ( String name ) { } public static final List getDescriptions ( ) { } protected static List getDescriptions0 ( ) { } public static ISynchAsynchConnection makeSynchAsynchConnection ( ISynchAsynchConnectionEventHandler handler , ConnectionDescription desc , Object [ ] args ) throws ConnectionInstantiationException { } public static ISynchAsynchConnection makeSynchAsynchConnection ( ISynchAsynchConnectionEventHandler handler , ConnectionDescription desc , String [ ] argTypes , Object [ ] args ) throws ConnectionInstantiationException { ConnectionFactory . debug ( ( ( ( ( ( ( ( ( "makeSynchAsynchConnection(" + handler ) + "," ) + desc ) + "," ) + ( Trace . convertStringAToString ( argTypes ) ) ) + "," ) + ( Trace . convertObjectAToString ( args ) ) ) + ")" ) ) ; if ( handler == null ) throw new ConnectionInstantiationException ( "ISynchAsynchConnectionEventHandler<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>null" ) ; if ( desc == null ) throw new ConnectionInstantiationException ( "ConnectionDescription<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>null" ) ; ConnectionDescription cd = desc ; if ( cd == null ) throw new ConnectionInstantiationException ( ( ( "ConnectionDescription<seq2seq4repair_space>" + ( desc . getName ( ) ) ) + "<seq2seq4repair_space>not<seq2seq4repair_space>found" ) ) ; ISynchAsynchConnectionInstantiator instantiator = null ; Class [ ] clazzes = null ; try { instantiator = ( ( ISynchAsynchConnectionInstantiator ) ( cd . getInstantiator ( ) ) ) ; clazzes = AbstractFactory . getClassesForTypes ( argTypes , args , cd . getClassLoader ( ) ) ; if ( instantiator == null ) throw new InstantiationException ( ( ( "Instantiator<seq2seq4repair_space>for<seq2seq4repair_space>ConnectionDescription<seq2seq4repair_space>" + ( cd . getName ( ) ) ) + "<seq2seq4repair_space>is<seq2seq4repair_space>null" ) ) ; } catch ( Exception e ) { throw new ConnectionInstantiationException ( ( ( "Exception<seq2seq4repair_space>getting<seq2seq4repair_space>instantiator<seq2seq4repair_space>for<seq2seq4repair_space>'" + ( desc . getName ( ) ) ) + "'" ) , e ) ; } ConnectionFactory . debug ( ( "makeSynchAsynchConnection:got<seq2seq4repair_space>instantiator:" + instantiator ) ) ; <START_BUG> return instantiator . makeInstance ( handler , clazzes , args ) ; <END_BUG> } public static ISynchAsynchConnection makeSynchAsynchConnection ( ISynchAsynchConnectionEventHandler handler , String descriptionName ) throws ConnectionInstantiationException { } public static ISynchAsynchConnection makeSynchAsynchConnection ( ISynchAsynchConnectionEventHandler handler , String descriptionName , Object [ ] args ) throws ConnectionInstantiationException { } public static ISynchAsynchConnection makeSynchAsynchConnection ( ISynchAsynchConnectionEventHandler handler , String descriptionName , String [ ] argTypes , Object [ ] args ) throws ConnectionInstantiationException { } public static final ConnectionDescription removeDescription ( ConnectionDescription scd ) { } protected static ConnectionDescription removeDescription0 ( ConnectionDescription n ) { } }

Fix:
return instantiator . makeInstance ( desc , handler , clazzes , args ) ;